Server unit



FIG. 1 is a front view of a server unit showing our design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a first side view thereof; and,

FIG. 5 is a second side view thereof, opposite the first side.

The broken lines in the drawings illustrate portions of the server unit, or environment, and form no part of the claimed design. Cross-hatched lines in the drawings illustrate color and form no part of the claimed design. 

The ornamental design for a server unit, as shown and described. 